(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)^2急用!

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(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)^2急用!(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)^2急用!(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)

(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)^2急用!
(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)^2
急用!

(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)^2急用!
(m-n)^7/(n-m)^6+(-n-m)^3/(m+n)^2
=(m-n)^7/(m-n)^6-(m+n)^3/(m+n)^2
=(m-n)-(m+n)
=m-n-m-n
=-2n

-2n

=(m-n)^7/(m-n)^6+〖-(m+n)^3/(m+n)^2
=m-n-(m+n)
=-2n